Yo Will,I looked up the blue print specs. that Bruce Fulper aka;(Rock@Roll- fulperformance) they are;
"On a 3.250 main bore,(421/428/455) the main factory says; 3.4380-3.4390."
"Again,we use 3.3480-3.3485."
"And note that the checking clearance is taken from the twelve-to-six o'clock position
using a calibrated dial bore gauge."
"Using his specs. maintains good crush on the bearings,THIS IS CRUCIAL...The same theory applies to the rod bores"..
"And all Pontiac rod bores are 2.3745-2.3750.Again we use the small to the middle 2.3745 to 2.3748.Always preferring the smaller dimension."
And as you know these specs.are the size of the hole without the bearings in place.
Hope that helps, Steve.
[This message has been edited by KS circutguy (edited 11-13-2000).]
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